Posted by doris on Monday, November 17, 2008 at 6:47pm.
a cell membrane protects the interior contents present in the cell from spilling out into the external environment. it also protects the cell from harmful substances present in the external environment from entering into the cell!
What amanda has said is true but it doesn't answer the question. The role of the cell membrane in moving substances in and out of the cell is that the membrane functions as a semipermeable membrane and osmosis occurs through the membrane.
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